EP0562078A1 - Non-malodorous hair perming method. - Google Patents

Abstract

Permanent hair deformation process. This process, which comprises a reduction step using cysteamine or one of its salts and an oxidation step, is characterized in that before or after the oxidation step, one applies to hair a composition containing, in a cosmetically acceptable vehicle, a monoaldehyde compound. This process effectively combats residual odors from the reducing agent.

Description

 A process of permanent deformation of the hair that does not generate an unpleasant odor.

The present invention relates to a new process for permanent deformation of the hair using as the main reducing agent of cysteamine, this process comprising a particular treatment making it possible to combat the unpleasant residual odor permeating the hair.

 The conventional technique for carrying out permanent deformation of the hair consists in firstly opening the disused bridges of the keratin using a composition containing a reducing agent (reduction step), then, after having preferably rinsed the hair, to reconstitute in a second time said disulfide bonds by applying to the hair under tension, an oxidizing composition (oxidation step also called fixing) so as to give the hair the desired final shape. The application of the reducing composition can be carried out before or after winding the hair on the curlers.

 This technique of permanent deformation of the hair makes it possible indifferently to produce a waving of the hair, either straightening or straightening.

 The compositions for carrying out the first stage of a perming operation are generally in the form of lotions, creams, gels or powders to be diluted in a liquid support, and contain, as reducing agent, preferably a thiol .

 Among the thiols recommended for carrying out the first phase of a perming operation, cysteamine or 2-amino ethanethiol has proved to be particularly favorable for obtaining good curling of the hair, but it has been found that the hair thus treated developed sometimes, after a week to a month, a very unpleasant smell.

 This bad odor is more particularly perceptible when the treated hair is in the wet state or in a humid environment. Thus, the appearance of bad odors is particularly favored by a hot and humid climate or by a tendency of the subject to secrete a lot of sebum.

Because of this drawback, cysteamine and also its salts, even at low concentrations, are generally not used as a reducing agent in a process of permanent deformation of the hair.

 After various researches, it was surprisingly and unexpectedly found that it was possible to prevent the appearance of bad odors due to the use of cysteamine or one of its salts, by proceeding before or after the step of fixing, to the application of a composition containing in a cosmetically acceptable vehicle a mono aldehyde compound.

 The present invention therefore relates to a process for permanent deformation of the hair comprising a reduction step using a reducing composition containing cysteamine or one of its salts and an oxidation step, this process being characterized in that before or after the oxidation step, a composition is applied to the hair containing in a cosmetically acceptable vehicle a compound

 mono-aldehyde to combat the unpleasant residual odor permeating the hair.

 As monoaldehyde compound, it can be used according to

 the invention, formaldehyde or an aromatic aldehyde chosen from 2,4,6-trihydroxybenzaldehyde, α-methyl β- (p-tert-butyl phenyl)

 propionaldehyde, 2-methyl-4- (2,6,6-trimethyl-2 (1) cyclohexene-1-yl) butanal, 2-hexyl-3-phenyl 2-propenal, 3,4-dimethoxybenzaldehyde, 2,3,4-trimethoxybenzaldehyde, 2,5-dimethoxybenzaldehyde and 4-hydroxy 3-methoxybenzaldehyde.

 Preferably, the monoaldehyde compound is used at a molar concentration of between 0.15 and 1.8 moles and preferably between 0.22 and 0.8 moles.

 The cosmetically acceptable vehicle is an aqueous solution or an alcoholic or hydroalcoholic solution of a lower aliphatic alcohol such as ethanol or isopropanol.

 According to a preferred embodiment of the method according to the invention, the hair is rinsed with water prior to the application of the composition containing the monoaldehyde compound.

The composition containing the monoaldehyde compound can of course contain various cosmetic ingredients such as for example an anionic, nonionic or amphoteric or zwitterionic or cationic surfactant, an alkalizing or acidifying agent, a preservative, a stabilizer, a treatment agent such as cations and polymers, a dye, a sunscreen, a thickening agent or a pearlescent agent.

 According to the process of the invention, the composition containing the monoaldehyde compound is applied before or after the application of the oxidizing composition for 1 to 60 minutes on the hair. After

treatment, the hair can be optionally rinsed with water except when the monoaldehyde compound is formaldehyde in which case it is systematically rinsed.

 According to a particularly preferred embodiment of the process according to the invention, the composition containing the compound

monoaldehyde is applied to the hair before the oxidation step, the hair having been previously rinsed with water after the reduction step.

 When according to the invention the composition containing the monoaldehyde compound is applied after the oxidation step, the application can be immediate or delayed over time and optionally repeated one or more times.

 According to the invention, cysteamine or one of its salts is present in the reducing composition at a concentration of between 2 and 12% by weight of cysteamine base relative to the total weight of the reducing composition. The reducing composition may optionally contain a secondary reducing agent such as for example thioglycolic acid, glycerol thioglycolate or cysteine.

 Preferably, the pH of the reducing composition is between 6 and 10 and is obtained using an alkaline agent such as for example ammonia, monoethanolamine, diethanolamine, triethanolamine, an alkali carbonate or bicarbonate or of ammonium, an alkali hydroxide or using an acidifying agent such as for example hydrochloric acid, acetic acid, lactic acid, oxalic acid, boric acid, citric acid or phosphoric acid or also by means of a buffer such as for example mono and dipotassium phosphate and ammonium acid carbonate.

 According to a preferred embodiment, the reducing composition may also contain a surfactant of the nonionic, anionic, cationic or amphoteric type.

The reducing composition may also contain treating agents, active substances such as panthotenic acid, agents fall arresters, dandruff agents, thickeners, suspending agents, sequestering agents, clouding agents, dyes, sunscreens as well as perfumes and preservatives and

 possibly other reducing agents.

 The oxidizing composition is of the type commonly used and contains a known oxidizing agent for hydrogen peroxide, an alkali bromate, a persalt, a polythionate or a mixture of alkali bromate and parsley. The concentration of hydrogen peroxide can vary from 1 to 20 volumes and preferably from 1 to 10, the concentration of alkali bromate from 2 to 12% and that of parsley from 0.1 to 15% by weight relative to the total weight of the oxidizing composition. The pH of the oxidizing composition is generally between 2 and 8 but preferably between 3 and 6.

 We will now give by way of illustration several examples of the process for permanent hair deformation according to the invention.

EXAMPLES EXAMPLE 1:

The following reducing composition (A) is applied to wet hair, previously wound on curlers with a diameter of 14 mm.

Composition (A):

- Cysteamine hydrochloride .............................................. ............ 11.3 g

- Oleocetyldimethylhydroxyethylammonium chloride

 in aqueous solution at 30% active ingredient ................................ 0.39 g (Ma)

- Ammonia ................................................ ..... qs pH = 8.5

 - Water ................................................ ........................................... q.sp 100 g

 After having left the composition to act for 15 minutes, the hair is rinsed with running water and the following composition (B) is then applied to the hair:

Composition (B): - Formaldehyde ................................... ........ ....................... 0.2 g

- Water ................................. ............... ............ qs 100 g The composition is left to act for 15 minutes, then rinsed again with running water before applying the following oxidizing composition (C): Composition (C):

- Hydrogen peroxide in aqueous solution at 200 Volumes .... 4.8 g

 - Citric acid ......................................... qs pH = 3

 - Water ................................................ ............. qs 100

After having allowed the oxidizing composition to act for 5 minutes, it is rinsed with water and then the curlers are removed and the hair is dried.

We do not notice the formation of bad odors over time, even after the hair has been moistened.

 By way of comparison, the same process was carried out by omitting the treatment using composition (B) and it was found that after a certain period of time, the hair gave off an unpleasant odor. COMPARATIVE STUDIES

A. Treatment before the oxidation stage:

Ten strands of hair weighing approximately 2.5g each are treated with a shanrpoing and then rinsed. The following reducing composition is then applied to each of the locks:

Cysteamine hydrochloride ............................... 9.6 g

Tegobetaine ................................................. ............... 1 g 20% ammonia in water qs ........................ pH 8.5

Demineralized water qs .......................... 100 g

After having left to act for 15 minutes, the 10 wicks are rinsed with water.

One of the locks is kept as a control and the nine remaining locks are treated respectively with the following treatment compositions 1 to 9: Composition 1

2,4,6-trihydroxybenzaldehyde ............................. 7.7 g ethyl alcohol ........ ............................. 50 g demineralized water .......... qs ...... ................ 100 g

Composition 2 α -methyl-β - (p-tert-butylphenyl) propionaldehyde

 (sold under the name of "Lilial" by the

 GIVAUDAN Company) ............................................... 8 g ethyl alcohol ............ qs ......................... 100 g

Composition 3

2-methyl-4- (2,6,6-trimethyl1-2 (1) -cyclohexene

 -1-yl) butanal (sold under the name of

 "Ketonal" by the company GIVAUDAN) ................... 9.1 g ethyl alcohol ............. qs ... ..................... 100 g

Composition 4

3,4-dimethoxybenzaldehyde .............................. 6.2 g ethyl alcohol ......... qs ........................ 50 g

Demineralized water ..... qs ................................. 100 g

Composition 5

2,3,4-trimethoxybenzaldehyde .............................. 9.8 g ethyl alcohol .... qs .. ............................ 100 g

Composition 6

2,5-dimethoxybenzaldehyde ................................. 8.3 g ethyl alcohol qs ..... ................................ 100 g Composition 7

2-hexyl-3-phenyl-2-propenal (sold under the

 name of "hexyl cinnamic aldehyde"

 by the GIVAUDAN Company) ................................. 10.8 g ethyl alcohol .... qs. .............................. 100 g

Composition 8

Formaldehyde 30% in water ..................................... 3 g

Demineralized water .... qs ...................................... 100 g

Composition 9

4-hydroxy 3-methoxybenzaldehyde .................................... 7.6 g

20% ammonia in water .............. qs ..................... pH 8.5

Demineralized water .... qs ........................................... ........ 100 g

After having left to act for approximately 15 minutes, rinse thoroughly, and apply to the nine locks thus treated and to the control lock an oxidizing composition consisting of:

 8-volume hydrogen peroxide ..................................... 100 g

Citric acid .... qs ........................................... ......... pH3

After an exposure time of 5 minutes, the ten locks are rinsed with water.

 After drying, the locks are hung in separate compartments for 4 days.

 After the second day, the locks are subjected to a shampoo, washed with water and dried.

 On the fourth day, the wicks are sprayed with water and subjected to a panel of 4 people, in order to determine if they emit residual odors. The intensity of the smell is noted according to the scale

next : 0 ...................... no smell

 1 ....................... very weak odor

 2 ...................... weak odor

 3 .................... noticeable odor

 4 ......................... strong odor

 5 ..................... strong odor

 6 ................... very strong odor

The results obtained are collated in the following table

Wicks Composition with Average Rating

 N ° treatment of perceived odors

1 (Witness) - 5.75

2 1 1

 3 2 1

 4 3 1.5

 5 4 1

 6 5 1

 7 6 3

 8 7 1.25

9 8 2.25

10 9 2 As can be seen, the treatment of the locks between the reduction step and the oxidation step, using a composition containing a monoaldehyde compound, very strongly reduces the presence of odors residual. Only the composition (6) containing 2,5-dimethoxybenzaldehyde gives a significantly lower result than the other compositions. B. Treatment after the oxidation step

 According to the same procedure as described above in (A), nine locks were treated using the following reducing composition:

Cysteamine hydrochloride ....................................... 10 g

Glycerol thioglycolate ................................... 3.1 g

Tegobetaine ................................................. ......... 1 g

Ammonia at 20% in water ....................... qs. pH 7.5

Demineralized water ....................... qs .. 100 g

After having allowed to stand for 15 minutes, the locks are rinsed with water and the following oxidizing composition is applied:

 8-volume hydrogen peroxide ................................. 100 g

Citric acid qs ............................................... ..... pH 3

 Leave to act for 5 minutes and then treat 8 of the locks (one being kept as a control) by the treatment compositions 10 to

17 following:

Composition 10

2,4,6-trihydroxybenzaldehyde ............................ 6 g ethyl alcohol ........... ............................................. 50 g

Demineralized water qs ............................................ 100 g

Composition 11 α -methyl- β- (p-tert-butylphenyl) propionaldehyde 5 g ethyl alcohol qs ............................. .. 100g

Composition 12

2-methyl-4- (2,6,6-trimethyl-2 (1) -cyclohexene-1-yl) butanal ....................... ................................... 5.2g ethyl alcohol qs ......... ............................. 100 g Composition 13

3,4-dimethoxybenzaldehyde ...................................... 4,2g ethyl alcohol qs. .......................................... 50 g

Demineralized water qs ........................................ 100 g

Composition 14

2,3,4-trimethoxybenzaldehyde ........................................... 4.85g ethyl alcohol qs ........................................... .......... 100g

Composition 15

2,5-dimethoxybenzaldehyde ...................................... 5.8 g ethyl alcohol qs .................................................. ... 100 g

Composition 16

2-hexyl-3-phenyl-2-propenal .................................... 8.8 g ethyl alcohol qs ............................................. 100g omission 17

4-hydroxy 3-methoxybenzaldehyde ................................ 6.8g

20% ammonia in water qs ................................ pH 8.5

Demineralized water qs ............................................... ............. 100 g

The locks including the control lock are after 4 days subjected to a panel of 4 people in order to determine if they emit residual odors according to the same scale as that given above in (A). The results obtained are collated in the following table:

Wicks Composition with Average Rating

 N ° treatment of perceived odors

1 (Witness) - 5.75

 2 10 2.25

 3 11 2

 4 12 2

 5 13 1.75

 6 14 2

 7 15 3

 8 16 2.25

 9 17 1.75

The results obtained show that, compared to the control, the decrease in residual odor is quite significant. By comparing the results of the treatment studies, before or after the oxidation step, it can be seen that, surprisingly, a more substantial reduction in residual odors is obtained when the composition containing the monoaldehyde compound is applied before the composition oxidizing.

Claims

REV ENDICATIONS

1. A method of permanent hair deformation comprising a reduction step using a composition based on cysteamine or one of its salts and an oxidation step, characterized in that before or after l oxidation step, a composition is applied to the hair containing, in a cosmetically acceptable vehicle, a compound

 monoaldehyde.

 2. Method according to claim 1, characterized in that the monoaldehyde compound is formaldehyde or an aromatic aldehyde chosen from:

 2,4,6-trihydroxybenzaldehyde, α -methyl β- (p-tert-butyl phenyl) propionaldehyde, 2-methyl-4- (2,6,6-trimethyl-2 (1) cyclohexene-1- yl) butanal, 2-hexyl-3 phenyl 2-propenal, 3,4-dimethoxybenzaldehyde, 2,3,4-trimethoxybenzaldehyde, 2,5-dimethoxybenzaldehyde and 4-hydroxy 3-methoxybenzaldehyde.

 3. Method according to claim 1 or 2, characterized in that the monoaldehyde compound is present at a molar concentration of between 0.15 and 1.8 moles and preferably between 0.22 and 0.8 moles.

 4. Method according to any one of the preceding claims, characterized in that the cosmetically acceptable vehicle is an aqueous solution or an alcoholic or hydroalcoholic solution of a lower aliphatic alcohol.

 5. Method according to any one of the preceding claims, characterized in that the composition containing the monoaldehyde compound also contains at least one cosmetic ingredient chosen from an anionic, nonionic or amphoteric or zwitterionic or cationic surfactant, an agent alkalizing or acidifying, a preservative, a stabilizer, a treatment agent, a dye, a sunscreen, a thickening agent or a pearling agent.

 6. Method according to one of claims 1 to 5, characterized in that the hair is rinsed with water prior to the application of the composition containing the mono-aldehyde compound.

7. Method according to any one of the preceding claims, characterized in that the composition containing the monoaldehyde compound is applied to the hair for a time from 1 to 60 minutes.

8. Method according to any one of the preceding claims, characterized in that an aqueous formaldehyde composition is applied to the hair and that the hair is rinsed with water.

 9. Method according to any one of the preceding claims, characterized in that the composition containing the compound

monoaldehyde is applied to the hair before the oxidation step, the hair having been previously rinsed with water after the reduction step.